2026 Subaru Uncharted

The contact owns a 2026 Subaru Uncharted. The contact stated that while attempting to start the vehicle, the vehicle failed to start. The contact stated that the 12-Volt battery was completely drained, even though the main high-voltage traction battery used to power the electric motor was charged. The vehicle was taken to a dealer, and a new 12-Volt battery was installed; however, two days later, the vehicle failed to start again. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 650.

The 12V battery of my brand new 2026 Subaru Uncharted (under 300m) was fully drained after being parked for 2.5 days while traveling. I was unable to use my car to leave the location and needed to have a jump pack brought to the car. The car has been back at the dealer to be inspected for 19 days and counting. The battery has failed a number of times while at the dealer, with no diagnosis from Subaru and no offer to replace.

On three separate incidents, my 12V battery drained leaving me stranded. The car was purchased [XXX]. I called road service for a jump, then jumped car myself for next two battery drain issues. Took to dealer(subaru chandler superstore) in chandler AZ. The dealer could not reproduce problem, stated battery was good. Also did parasitic draw test which was ok. I have since had to disconnect DCM services which stopped battery drain. There were no warnings to indicate battery was dead/dying. Problem first happened early in July, around [XXX]. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Since 2023 starting with the Subaru Solterra and Toyota Bz4 and now in 2026 both companies have 3 models each. Toyota builds all of them for themselves and Subaru. If you do not drive these cars daily the 12 volt batteries go dead. Subaru and Toyota has continuously denied a problem and advises owners to jump it themselves or connect a battery maintainer hoping to sweep this dangerous problem under a rug. It is dangerous that can leave you stranded or if you need to go somewhere right away you can't. If you do a google search or Reddit search about 12 volt dead batteries on Subaru Solterra, Uncharted and Trailseeker you will see hundreds of complaints and with Toyota the Bz4, Bz, CH-R. Both companies deny there is a problem. My own 2 month old Subaru Uncharted was parked and not driven for 3 days and the 12 volt battery was dead and I called Subaru Roadside Assistance and he jumped it and stated it was at 3 volts, he said he has jumped a lot of Toyota EV's I thenI drove the 35 miles to the dealer and it charged while driving and it passed the test, if it was towed it would have failed but I had no way to get to the dealer. On the invoice the tech wrote "Tested 12v battery. Battery passed. Use of trickle charger if vehicle won't be driven for days is recommended". That is not an answer, it needs to be fixed with ALL Subaru and Toyota EV's. If you park outside then how to connect a trickle charger, you go on a vacation and park in a public lot and come back to a dead battery after a week. Please investigate this. There are classaction lawsuits for the 2023-2025 now and am sure the 2026's will be added. Owners are documenting everything and doing lemon law buybacks. Subaru and Toyota needs to be held accountable. In my opinion the problem is with the Battery Management System,ALL other EV's monitor the 12 volt battery voltage and when it falls to a set level the high voltage battery charges it but not Subaru or Toyota it does not monitor the voltage.

It is an EV, the 12 volt battery went dead after sitting 3 days. Problem is all other EV's charge the 12 volt when the voltage goes below a certain level, while the Subaru only charges the 12 volt while driving and if parked then it is on a timer and only every 20 days. I have attached a copy of the service manual someone posted. This is unsafe. Only have the car purchased new May 24, 2026. Complaints all over the internet especially on its Toyota twin the BZ as more of those sold.

The uncharted and its related models (subaru solterra and trailseeker, Toyota bZ, bZ Woodland, and C-HR, and Lexus RZ) have an issue that bricks the car. It drains the 12V battery. Our car needed a jump because the Toyota app/subaru connect app and connected services kept waking the car up, draining the 12V battery and preventing it from turning on. This car appears to have a DCM issue and exceptionally bad software that causes parasitic drain on the 12V battery. It shares the same connected services, infotainment, and other software with every Toyota and Lexus model except the GR86, and the other two Subaru EVs, the Trailseeker and Solterra. We’ve taken the car to the dealer (Timmons Subaru) who told us to bring it back if it ever happens again. Their check resulted in a good health for the 12V battery, we think that was due to the car being jumped and driven.